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Homework Help: Length of a spring

  1. Apr 30, 2009 #1
    The question is... suppose it requires 100 dynes to change the length of a certain spring 5 cm. What force is required to change the length of the spring 20 cm?

    Would you just multiply it... and say it would take 400 dynes?
  2. jcsd
  3. Apr 30, 2009 #2
    Sounds good to me :smile: Springs are linear. If you wanted to be more formal about it, you could find the spring constant k from Fspring=k*x since you know Fspring and you know x.
  4. Apr 30, 2009 #3
    Okay, thank you! Just wanted to make sure i wasn't missing a formula somewhere
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